Wolfram|Alpha’s Computational Knowledge Engine not only retrieves data but crunches it for you—very useful, if you phrase your query well. Play with that here.

DuckDuckGo’s claim to fame is that they don’t track us; privacy champions like that. A lot. The site provides brief info, say from a dictionary or Wikipedia, as well as related topics at the top of the results page. It’s also blissfully free of advertising clutter. Check that out here.

According to the Wolfram Alpha blog, they are combining the Wolfram|Alpha functionality with the DuckDuckGo search:

So what does this new partnership mean for you? If you are a DuckDuckGo user, you’ll start to notice expanded Wolfram|Alpha integration. DuckDuckGo will start adding more Wolfram|Alpha functionality and datasets based on users’ suggestions. If there’s a specific topic area you’d like to see integrated into DuckDuckGo, your suggestions are welcome.

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Stephen E. Arnold monitors search, content processing, text mining
and related topics from his high-tech nerve center in rural Kentucky.
He tries to winnow the goose feathers from the giblets. He works with colleagues
worldwide to make this Web log useful to those who want to go
"beyond search". Contact him at sa [at] arnoldit.com. His Web site
with additional information about search is arnoldit.com.